In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
you may have , you should gather your courage to face the challenge .
Looking back on the three - year life in the mountain village, Thomas it as a milestone in his personal development
- - How dangerous it was! - - Yes, but for the passer - by' s quick action, the girl _____
-When will the expert come and give the lecture on economic development -Not until our program ____by the government
The question that puzzled them is ____ they can get rid of the air pollution in the area.